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Why Do My Air Ducts Smell Like Smoke? - 6 Causes and Their Solutions

Eric Bullard • 12 July 2024

Discovering an unknown and unpleasant odor in your home is always concerning. One commonly unsuspected culprit of a “smoke”, or “burning” smell comes from a home’s AC (air duct) system. If your air ducts have a lingering smell of smoke, here are six reasons why, and what to do about it.



1) Dirty Air Filter  


The first thing you should check is your air filter. Having a dirty air filter can not only cause unpleasant odors, but it can also lead to weak performance of your unit, many times even causing it to overheat. This is due to the filter being clogged with dirt and debris, leading to restricted air flow.


Solution: Replacement of old air filter. This can easily be done at home with the help of a ladder. Make sure you have the correct measurements of the filter, as they vary in many different sizes. Read your owner’s manual to find out how often you should replace your filter.




2) Failing HVAC system 


In some cases, a malfunctioning HVAC system can cause a “burning” smell to emit from your air ducts. If there is a problem with any of your HVAC components, it can produce a burning odor that can be mistaken for smoke. There are 2 main faulty components that you should be wary of:

  • Broken Fan Belt - Burning smell accompanied by a squealing noise.
  • Overheated Fan Motor - Burning smell due to overheating. This is a serious issue that should be addressed ASAP.


Solution: Keeping up on regular maintenance of your HVAC system. It is important to make sure each of these parts are fixed or replaced by a professional technician to ensure a safe installment, and prevent any further damage to your unit. 




3) Electrical Failure

A lingering burning smell followed by a popping sound in the same area can be a sign of an electrical failure. The burning smell may be a result of sparks and heat build up.


Solution: If you believe it can be an electrical failure, be sure to turn your AC unit off immediately and contact a technician to take a look at it. Electrical failure should only be handled by a professional with proper safety training. 




4) Damaged Capacitor 


The capacitor is responsible for storing electrical energy and helps to start the AC unit's compressor. The capacitor can cause a burning smell if there is regular overheating. Some signs of damage include: 

  • AC not starting up
  • Strange noises coming from unit
  • Capacitor is visibly damaged or swollen 


Solution: Attempting to repair this yourself can be extremely dangerous, so be sure that you contact a professional technician right away!




5) Debris build-up 


Over time, dirt and debris can accumulate in your ductwork and its components. When your unit is turned on for the first time in a while, it can cause the unit’s fan blades to create a musty odor that can be mistaken as smoke.


Solution:  Regular air duct cleaning is essential to preventing debris buildup + keeping your home smelling fresh.




6) Smoke Byproducts


If you or any previous owners have ever smoked inside the home, it is likely that your air ducts are coated in smoke byproducts such as nicotine and tar. 


Solution: Hiring a professional to clean your air ducts will help rid of any smoke byproducts + odor particles, as well as any dust and debris that have accumulated over time. There are many health benefits to regular maintenance of your air ducts. 




Conclusion


Overall, if you're experiencing a burning smell coming from your AC unit, it is essential to address the issue promptly. It is best to hire professional technicians with safety training to take a look at any issues with your air ducts in order to prevent further damage to the unit, or any harm to yourself. Regular maintenance of your air duct system has endless benefits, resulting in a long-lasting unit that keeps your home safe and comfortable all year long. 



In need of professional Air Duct Cleaning in Tucson, AZ? Steam Smart Pro is your solution! Schedule online or call (520)416-4308 for a FREE quote today!



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by Josh Crouch • 7 May 2024
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